Radius, a US-based provider of software solutions, has named former Grant Thornton US CEO Stephen Chipman as its new CEO. Chipman, who succeeds Chris Stone, will be based in the company’s Boston headquarters.

With over 800 employees based in offices in the US, the UK, Brazil, China, India, Japan and Singapore, Radius is one of the larger advisory and technology firms that supports clients with global expansion services and solutions. The company, formed in 2014 through the merger of Nair & Company and High Street Partners, serves over 600 clients operating in 110 countries around the world. The Boston-headquartered firm has seen rapid growth in recent years, and is backed by among others HgCapital (the private equity business that purchased Nair & Co. in August 2013), Silicon Valley Bank and Lloyds.

“We’ve established Radius as a recognised expert in helping US-based companies expand internationally,” says Chris Stone, who has been at the helm of Radius since the summer of 2013, landing the top job after previously serving as CEO of Nair & Company. Three years in the role, Stone has decided to step down as CEO, but will remain a member of Radius’ board of directors. Stephen Chipman, the former CEO of Grant Thornton in the US, has been named his successor, and been tasked with further expanding Radius’ international footprint. “Our growth opportunity is significant,” comments Chipman.

During his 34-year tenure with Grant Thornton, Chipman held leadership positions in Europe, North America and Asia. He served as the firm’s Senior Vice Chairman, CEO of Grant Thornton China Management Corporation – where he helped create a single national Chinese firm with more than 2,500 people in 17 offices – and finally US CEO. During his most recent tenure heading the professional services giant’s US operations, Chipman led the company to double-digit revenue increases through strategic acquisitions and services expansion.

Reflecting on Chipman’s appointment, Stone says: “Stephen has been in this position before and his leadership will enable Radius to accelerate growth plans through strategic acquisition, continued services expansion and flawless execution of our unique services model.”

“I’m excited and energized by what the Radius team has built,” says Chipman. “The unique combination of accounting, finance, banking, tax, HR, legal and compliance experts, expansion-related processes and technology delivers what can best be described as ‘expansion-as-a-service.’ This is a highly differentiated offering, and the timing is perfect as international growth has now reached the top of managements’ agendas.”